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# SPDX-License-Identifier: GPL-2.0-only
config UBIFS_FS
tristate "UBIFS file system support"
select CRC16
select CRC32
select CRYPTO if UBIFS_FS_ADVANCED_COMPR
select CRYPTO if UBIFS_FS_LZO
select CRYPTO if UBIFS_FS_ZLIB
select CRYPTO if UBIFS_FS_ZSTD
select CRYPTO_LZO if UBIFS_FS_LZO
select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
select CRYPTO_ZSTD if UBIFS_FS_ZSTD
select CRYPTO_HASH_INFO
select UBIFS_FS_XATTR if FS_ENCRYPTION
depends on MTD_UBI
help
UBIFS is a file system for flash devices which works on top of UBI.
if UBIFS_FS
config UBIFS_FS_ADVANCED_COMPR
bool "Advanced compression options"
help
This option allows to explicitly choose which compressions, if any,
are enabled in UBIFS. Removing compressors means inability to read
existing file systems.
If unsure, say 'N'.
config UBIFS_FS_LZO
bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
default y
help
LZO compressor is generally faster than zlib but compresses worse.
Say 'Y' if unsure.
config UBIFS_FS_ZLIB
bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
default y
help
Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
config UBIFS_FS_ZSTD
bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
depends on UBIFS_FS
default y
help
ZSTD compresses is a big win in speed over Zlib and
in compression ratio over LZO. Say 'Y' if unsure.
config UBIFS_ATIME_SUPPORT
bool "Access time support"
default n
help
Originally UBIFS did not support atime, because it looked like a bad idea due
increased flash wear. This option adds atime support and it is disabled by default
to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
which means that file-system read operations will cause writes (inode atime
updates). This may affect file-system performance and increase flash device wear,
so be careful. How often atime is updated depends on the selected strategy:
strictatime is the "heavy", relatime is "lighter", etc.
If unsure, say 'N'
config UBIFS_FS_XATTR
bool "UBIFS XATTR support"
default y
help
Saying Y here includes support for extended attributes (xattrs).
Xattrs are name:value pairs associated with inodes by
the kernel or by users (see the attr(5) manual page).
If unsure, say Y.
config UBIFS_FS_SECURITY
bool "UBIFS Security Labels"
depends on UBIFS_FS_XATTR
default y
help
Security labels provide an access control facility to support Linux
Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
Linux. This option enables an extended attribute handler for file
security labels in the ubifs filesystem, so that it requires enabling
the extended attribute support in advance.
If you are not using a security module, say N.
config UBIFS_FS_AUTHENTICATION
bool "UBIFS authentication support"
select KEYS
select CRYPTO_HMAC
select SYSTEM_DATA_VERIFICATION
help
Enable authentication support for UBIFS. This feature offers protection
against offline changes for both data and metadata of the filesystem.
If you say yes here you should also select a hashing algorithm such as
sha256, these are not selected automatically since there are many
different options.
endif # UBIFS_FS
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